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  Q: Collision Detection (Snake/Tron)  (Read 2223 times)
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Offline kuldar

Senior Newbie





« Posted 2008-05-11 16:28:35 »

Hey! I have question about collisions for simple snake game. As far as i understand there are few types of them:
a) i could make an array with all the points on the screen and test against collision -> sounds pointless(worm size 1x1px and resolution 1900x1440(no comments on that this might not exist etc -> this is an example).
b)i could read screen bits information and say for example if color is black then *BOOM* gameover -> how would that work in java?

Or is there a better solution to this problem?

Take care,
Kuldar
Offline Eli Delventhal

JGO Kernel


Medals: 42
Projects: 11
Exp: 10 years


Game Engineer


« Reply #1 - Posted 2008-05-11 19:00:43 »

Oooh, people could go on about collision methods for years. This is one of the most difficult parts of any game.

If your snake has a fixed speed and doesn't move too far at once, then I would just do pixel-by-pixel checks. That means if he's trying to move 10 pixels to the right, for a for loop that goes 10 times, checking each pixel as he goes. Very simple to increment, and as long as your game isn't too complicated, it's reasonably fast. The color black thing would work just find for this (use the Raster of a BufferedImage), but the array would as well. 1900x1440 really is not that unreasonably large.

Indeed, there are plenty of better solutions, especially if you know the geometry of the level. But they are all rather difficult. Check these out:
http://www.gamasutra.com/features/20000330/bobic_01.htm
http://www.harveycartel.org/metanet/tutorials/tutorialA.html
http://geometrictools.com/Documentation/MethodOfSeparatingAxes.pdf
http://www.doc.ic.ac.uk/~dfg/AndysSplineTutorial/index.html

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Offline kevglass

« JGO Spiffy Duke »


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Coder, Trainee Pixel Artist, Game Reviewer


« Reply #2 - Posted 2008-05-11 19:42:11 »

Snake games are generally implemented with simple tile based collision.

Kev

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Offline Abuse

JGO Knight


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« Reply #3 - Posted 2008-05-11 21:18:04 »

Random thought of the day: MMO Snake  Grin

Make Elite IV:Dangerous happen! Pledge your backing at KICKSTARTER here! https://dl.dropbox.com/u/54785909/EliteIVsmaller.png
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